The Thirteenth Doctor is the current incarnation of the Doctor, the fictional protagonist of the BBC science fiction television programme Doctor Who. She is portrayed by English actress Jodie Whittaker, the first woman to play the character in the series.
In the series' narrative, the Doctor is a centuries-old Time Lord from the planet Gallifrey who travels in time and space in her TARDIS, frequently with Companions. At the end of life, the Doctor can regenerate her body; and in doing so gain a new physical appearance, and with it a distinct new personality; this plot mechanism has allowed the Doctor to be portrayed by a series of actors over the decades since the programme's inception in 1963. Whittaker's portrayal of the Doctor is a light-hearted adventurer with a passion for building things, placing a high value on friendships and striving for non-violent solutions. This incarnation of the Doctor travels with part-time warehouse worker Ryan Sinclair, retired bus driver and Ryan's step-grandfather Graham O'Brien and probationary police officer Yasmin Khan, all of whom she met shortly after her regeneration.
Whittaker appeared for the first time as the Thirteenth Doctor at the end of the 2017 Christmas special, "Twice Upon a Time", and stars as the Doctor from 2018, starting with the programme's eleventh series. She is set to continue in the role in the twelfth series in 2020.